Review follow-ups (split-verdict): ScheduleHeat re-seeds a Final heat; H2H no-show shrinks linear points; results export raw refs; odd-field H2H coverage

[ryan-johnson2]

From the 2026-07-03 release review — findings where one of two adversarial verifiers refuted; re-check before fixing:

• ScheduleHeat with an existing heat id may re-seed a finished/Final heat back to Scheduled (control_handler.rs ~380).
• head_to_head linear Points uses places.len() as heat size → a no-show shrinks everyone's points that heat (head_to_head.rs ~173).
• Default Generator::advancers wrong for head_to_head (FromHeatWinners advances losers) — dormant until tournaments return.
• Results JSON export may carry unresolved raw refs in heatResult/standings sections (results.ts ~63).
• head_to_head odd field (short last group) has no engine tests.

[ryan-johnson2]

All items resolved except the dormant advancers default (deferred to the tournament rebuild, where FromHeatWinners returns):

• ScheduleHeat re-seeds a Final heat — CONFIRMED, fixed in Backend validation batch: ScheduleHeat guards, membership pruning, DQ standings symmetry (#335, #336, #339, #341) #346 (only new ids accepted).
• H2H linear points priced by places.len() — CONFIRMED, fixed in Backend validation batch: ScheduleHeat guards, membership pruning, DQ standings symmetry (#335, #336, #339, #341) #346 (priced by group_size).
• Results export raw refs in legacy sections — CONFIRMED, fixed in Console: marshaling friendly names + robustness batch (#337, #340, #341) #345.
• Odd-field H2H coverage — added in Backend validation batch: ScheduleHeat guards, membership pruning, DQ standings symmetry (#335, #336, #339, #341) #346.
• Generator::advancers default for head_to_head — dormant in v1 (FromHeatWinners is carved out); tracked for the tournament rebuild.